Relationship between occlusal plane with upper airway morphological function and hyoid bone location as well as its application in orthodontic treatment of patients with malocclusion

doi:10.19438/j.cjoms.2020.03.012

Abstract

Abstract: PURPOSE: To study the correlation between occlusal plane, upper airway morphological function and hyoid bone location along with its application in orthodontic treatment of patients with malocclusion. METHODS: A total of 120 patients with Angle Class I malocclusion who underwent orthodontic treatment in our hospital from January 2014 to January 2019 were randomly enrolled. All subjects were observed before and 3 months after orthodontic treatment. Changes in upper airway morphological function indicators (SNA, SNB, ANB, SPPS, MPS, IPS, S-PNS, Ba-PNS) were recorded. Based on the occlusal plane angle (OP-SN) values, they were divided into group A (35 cases, 10°≤OP-SN<15°), group B (45 cases, 15°≤OP-SN<20°), and group C (40 cases, 20°≤OP-SN<25°). The changes in sleep monitoring indexes (mean oxygen saturation MSaO₂; minimum oxygen saturation LSaO₂; desaturation index, average pulse rate) and different occlusal plane angle (OP-SN), as well as upper airway morphological functional indexes (SNA, SNB, ANB, SPPS, MPS, IPS, S-PNS, Ba-PNS) and hyoid bone location(H-PS, H-VPS) 3 months after treatment were measured. Pearson correlation analysis was used to analyze the relationship between occlusion plane and upper airway morphological function and hyoid bone location with SPSS 20.0 software package. RESULTS: The upper airway morphological functions of SNA, MPS, IPS, S-PNS and Ba-PNS were improved after treatment, the upper airway morphological functions of SNB, ANB and SPPS were decreased compared with those before treatment (P<0.05). The angles of OP-SN and ANB in three different occlusal plans were increased with the increase of the angle of the occlusal plane, while the SNA and SNB angles were decreased with the increase of angle of the occlusal plane (P<0.05). OP-SN was negatively correlated with SNA and SNB (P<0.05), and positively correlated with ANB (P<0.05). The upper airway morphological function indicators of SNA, SNB, ANB, SPPS, MPS, TPS were positively correlated with H-PS and H-VPS (P<0.05). CONCLUSIONS: The occlusal plane in patients with Angle Class I malocclusion is closely related to upper airway morphological function and the position of hyoid bone.

Key words: Malocclusion, Orthodontic treatment, Occlusal plane, Upper airway, Hyoid bone, Correlation

CLC Number:

R782.2

WANG Wei, HUANG Jia-xin, ZHU Xing-yao. Relationship between occlusal plane with upper airway morphological function and hyoid bone location as well as its application in orthodontic treatment of patients with malocclusion[J]. China Journal of Oral and Maxillofacial Surgery, 2020, 18(3): 250-254.

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